/*
Copyleft (C) 2004 Hélio Perroni Filho
xperroni@yahoo.com
ICQ: 2490863

This file is part of ChatterBean.

ChatterBean is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

ChatterBean is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with ChatterBean (look at the Documentos/ directory); if not, either write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA, or visit (http://www.gnu.org/licenses/gpl.txt).
*/

package bitoflife.chatterbean;

import bitoflife.chatterbean.aiml.Category;
import bitoflife.chatterbean.text.Request;
import bitoflife.chatterbean.text.Response;
import bitoflife.chatterbean.text.Sentence;
import bitoflife.chatterbean.text.Transformations;

public class AliceBot {
  /*
  Attribute Section
  */

  /**
   * Context information for this bot current conversation.
   */
  private Context context;

  /**
   * The Graphmaster maps user requests to AIML categories.
   */
  private Graphmaster graphmaster;


  /**
   * Default constructor.
   */
  public AliceBot() {
  }

  /**
   * Creates a new AliceBot from a Graphmaster.
   *
   * @param graphmaster Graphmaster object.
   */
  public AliceBot(Graphmaster graphmaster) {
    setContext(new Context());
    setGraphmaster(graphmaster);
  }

  /**
   * Creates a new AliceBot from a Context and a Graphmaster.
   *
   * @param context     A Context.
   * @param graphmaster A Graphmaster.
   */
  public AliceBot(Context context, Graphmaster graphmaster) {
    setContext(context);
    setGraphmaster(graphmaster);
  }


  /**
   * 响应
   *
   * @param sentence 句子
   * @param that
   * @param topic
   * @param response 响应
   */
  private void respond(Sentence sentence, Sentence that, Sentence topic, Response response) {
    if (sentence.length() > 0) {
      Match match = new Match(this, sentence, that, topic);
      // 资料库中查找匹配串，匹配的方法
      // 支持通配符的trie查找算法
      Category category = graphmaster.match(match);
      if (category == null) {
        response.append("#");// 数据库查询
      } else {
        response.append(category.process(match));
      }

    }
  }

  /**
   * Responds a request.
   *
   * @param request A Request.
   * @return A response to the request.
   */
  public Response respond(Request request) {
    String original = request.getOriginal();
    if (original == null || "".equals(original.trim())) {
      return new Response("");
    }

    Sentence that = context.getThat();
    Sentence topic = context.getTopic();
    transformations().normalization(request);
    context.appendRequest(request);

    // 响应
    Response response = new Response();
    for (Sentence sentence : request.getSentences()) {
      respond(sentence, that, topic, response);
    }
    context.appendResponse(response);

    return response;
  }

  /**
   * Responds a request.
   *
   * @param input request string.
   * @return A response to the request string.
   */
  public String respond(String input) {
    Response response = respond(new Request(input));
    return response.trimOriginal();
  }
  
  /*
  Accessor Section
  */

  public Transformations transformations() {
    return context.getTransformations();
  }

  /**
   * Returns this AliceBot's Context.
   *
   * @return The Context associated to this AliceBot.
   */
  public Context getContext() {
    return context;
  }

  public void setContext(Context context) {
    this.context = context;
  }

  public Graphmaster getGraphmaster() {
    return graphmaster;
  }

  public void setGraphmaster(Graphmaster graphmaster) {
    this.graphmaster = graphmaster;
  }
}
